About usepreciso Units
120+ unit conversions across 12 categories.
What is this?
usepreciso Units is a collection of free utilities that run entirely inside your browser. There is no backend, no database, and no server processing any of the data you enter.
Every unit you need. No fluff.
🔒 Privacy by default
In the age of AI, everything you paste into a browser tool is potential training data for someone. A JWT you decode, a private document you run a word count on, a JSON payload you format - most tools send that to a server. Some feed it into models.
We built usepreciso so that question never arises. Every calculation, conversion, and transformation happens locally in your browser using JavaScript. Nothing is transmitted. Nothing is stored. Nothing is logged.
The tools
How it's built
Eight independent Next.js 14 apps share a single npm workspaces monorepo, with a shared@usepreciso/utilspackage for all core logic. Each app is deployed separately to Firebase App Hosting on its own subdomain.
All processing uses native browser APIs - Web Crypto for hashing, Intl for date formatting, Canvas for image processing. No heavy libraries where a native API exists.
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